Like many great dishes, the origins of chicken tikka masala (or CTM, as it's known to aficionados) is a subject of spicy debate. Ahmed Aslam Ali claims he invented the dish, which bears a strong resemblance to Punjabi butter chicken, in his Glasgow restaurant in the early 1970s after a customer complained that his chicken tikka was "a bit dry" – a story repeated by innumerable others, often embellished with the detail that the original sauce was made from tinned tomato soup.
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